Ball mill



July 19,

w. M. BARKER BALL MILL Filed Oct. 15, 1924 2 Sheets-Sheet l y 1927' w. M. BARKER BALL MILL Filed Oct 15, 1924 2 Sheets-Sheet 2,

Patented July 19, 1 927 UNITED STATES,

WILLIAM HLBABKEB, OI CANTON, OHIO.

BALL

Application ma October 15,1924, Serial rename.

The invention relates to a grinding mill of the horizontal, rotary ball carrying drum type for granulating coal, coke, colze breeze and like materials, and the objectsof the improvement are to simplify the feed, the

I granulating, and the delivery devices, to avoid abrasion and facilitate replacement of the screen plates, to reduce the material by the direct action of the balls themselves, and

-to produce a uniform granulation with a minimum of fine or powdered material.

These and other objects and benefits are attained by the construction and arrangement illustrated in the accompanying drawings forming part hereof, in which:

Figure 1 is an elevation section on the axis of the improved mill;.and

Fig. 2, an elevation section on line 2-2, g- Similar numerals. referto similar parts throughout the drawings:

Within a peripheral case- C is mounted a rotary drum D which is. preferably sup: portedsolely by a singletrunnion 3, which as shown may be and preferably is formed integral with the central portion4 of the rear head of the drum. For firmly-supporting the drum the trunnion is of relatively;

large lengthand diameter and to reduce its weight is preferably formed hollow as shown. The trunnion is suitably journaled in roller bearings 5 mounted in 'boxes 6 formed an outlet funnel 20 or secured on the top of standards 7 secured on the bed plate 8; and a gear wheel 9 may be keyed on the trunnion between the standards to receive power to rotate the drum.

The peripheral portion 4! of the rear head of the drum may be in the form of a ring secured by bolts 4" to the periphery of the 49 central portion 4 thereof, and a frame for the peripheral screening wall 10 of the drum may be formed by a plurality .of circumferentially spaced arms 11 extending directly forward from the peripheral ring 4' of the rear head of the drum, and preferably integral therewith.

The frame arms 11 may be in the form of channel bars with'ilanges 11' directed outward to give them the necessary strength and also to form fan vanes on the periphery of the drum, and upon the forward end of cacharm is preferably formed an outwardly extending L-fla-nge 11" to which the front head 12 ofthe drum may be secured by bolts 12'.

The front head .12 of the drum-is in the form of a disk plate having a conical protrusion-12" in the central portion and in the truncated apex of which is provided an orifice 13' through which an inclined chute 14 may be extended for feeding raw material into the forward side of the drum.

The peri heral screening-wall 10- of the drum may e made of sheet metal punched with perforations 10 of suitable size for passing the desired grade of granulation; and this sheet may be secured to the frame arms 11 by means of ball lifting bars 15 clamped against the inner side of the screen plate along the inner side of the frame bars by bolts 15 extending "from the-lifter bars through the screen plate and the frame bars. The ball lifting bars15 may be made of metal, rubber or other suitable material to form ribs or abutments for carrying and lifting the balls 16 u ward in one side of the drum without abra ing the screening wall by sliding thereon. I y he 'peri heral case C surrounding the drum may be made of sheet metal with a peripheral wall 17 and head flanges 17 and 17 extending inward to'overlap rabbeted peripheral portions 18'and 18' of the front and rear heads-of the drum; thereby'forming an annular channel or'duct 19 around the periphery of the drum.

Upon the top of the case G is connected comunicating with an outlet flue 21; one wall 20' of the funnel being formed to extend directly upward from the axial plane of the mill, and the other inclined wall 20" of the funnel being located beyond the upright wall 'in the directionof the rotation of the drum; so that .the outlet opening 22 of the case leading into the funnel is located beyond the upright axial plane of the case as the drum rotates.

Depending from the lower side or bottom of the peripheral case is formed an outlet hopper 23' terminating in a: restricted outlet mouth 23' which maybe and preferably 1 formed square in cross section.

Ade ending trough gate 24 is hinged by a rock ar 25 to the rear side of the mout of the hopper and is formed with a bottom wall 24', side walls 24K and a rear end wall 24' and wit-h'an open forward end and top. The forward end of the trou h gate extends a substantial distancein nt of the mouth of the discharge hopper and is no adjustably supported by a turn buckle link 26 so as to be raised and lowered to va the inclination of the bottom of the troug and its distance below" the mouth of the hopper.

In operation the material to be granulated is fed into the mill from the inclined chute 14 extending into the orifice '13 of the drum D. Rotation of the drum-by power applied through the gear wheel 9 causes the lifting bars 15 to bodily lift the balls 16 with the raw material upward in the direction of rotation of the drum, until the upper level of the balls exceeds the angle of repose; when the topmost balls successively fall back to the bottom of the drum, thence grinding and granulating the admitted material by direct impact and attrition between the balls themselves in the interior of the drum, and not between the balls and the screen plates.

wear upon the screen wall.

The fan vane formed by the frame arms' 11, upon rotation, create an exhaust fan effeet, causing air to be drawn into the drum through the orifice 13 along with the feed, to circulate in the peripheral case, and to be discharged thrmlgh the outlet funnel 20 and 21.

Any solid material passing through the screen wall into the peripheral case, and which may be carried upward by centrifugal action, or the circulating air,vwill strike against the inclined wall 20 of the funnel and be deflected downward into the case.

Any dust that may still rcmainin the air discharged intothe outlet flue may be collected in a cyclone collector and returned to storage.

A continuous automatic-air sealed discharge of the material granulated in the mill is efiected by properly positioning the turn buckle link 25, so that the angle of the bottom wall 24 of the depending trough gate 24 will be such that thegranulated material backs up into the outlet hopper, until the material head in the hopper is suflicient'.

to cause the material to slide down the inclined trough at .a substantially-nniform rate of speed.

The structure of the thus provides a slow spee ball mill, having all the drivmg mechanism on one side away from the feed'end, permitting free access to the interior of the resent invention mill by the removal of the front head, thereby enabling easy removal and replacement at theperipheral-screening wall and lifting ars.

The single trunnion support simplifies manufacture, maintenance and operation, and the arrangement of balls and ball lifters in the ,screen drum provides for free discharge of granulated material through the screen perforations without excessive quick discharge 1. A ball mill including a rotatable drum having opposite drum heads, a sole and relatively short supporting trunnion on one drum head, and a sole bearing bracket for the trunnion, a material inlet orifice in the other drum head, a removable blower case about the drum, communicating openings 'between the drum and the case, a material outlet for the case, and a separate air outlet for the case.

2. A ball mill including a drum having opposite drum heads, a sole and relatively short supporting trunnion on one drum head, I and a sole bearing bracket for the trunnion, the trunnion being rotatable in the'bearing bracket, a material inlet ori fice in the other drum head, a removable blower case about the drum, communicating openings between the drum and the case, a material outlet for the case, and a separate air outlet for the case.

3. A ball mill including a rotatable drum having opposite drum heads, asole and relatively short supporting trunnion on one drum head, a sole bearing bracket for the trunnion, and a material inlet orifice in the other drum head, fan arms on theoutside of the drum, a removable blowercase about the drum, communicating openings between the drum and the case, a materialoutlet for the case, and a separate air outlet for the case.

4. A ball mill including a rotatable drum having opposite drum heads, a sole and role tively short supporting trunnion on one drum head, and a bearing bracket for the trunnion, the other drum head being removable, a. material inlet orifice in the other drum head, a removable blower case about the drum, communicating openings between the drum and the case, a material outlet for the case, and a separate air outlet for the case.

5. A ball mill including a single rotatable annularv ring, arms connected to the ring, and screen drum walls supported by the arms, and the arms bein outside of the drum walls, a material in ct orifice for the E 'reen drum, a removable blower case about the screen drum, a material outlet for the case, and a separate air outlet for the case.

6. 'A ball mill including spaced arms, a rotatable drum supported by thearms' and removable lifting bars secured to the inner wall of the drum and to the arms.

7. A ball mill including a single rotatable trunnion, a bearing bracket for the trunnion, circumferentially spaced fan vane arms connected to the trunnion and screen drum walls supported by the arms, and the arms being outside of the drum walls, a material inlet orifice for the screen drum, a removable blower case about the screen drum,

a material outlet for the case, and a separate air outlet for the case.

8. A ball mill including a rotatable annular ring, fan vane arms connected to the ring, and screen drum walls supported by the arms, and the arms being outside of the drum walls, a material inlet orifice for the screen drum, a removable blower case about the screen drum, a material outlet for the case, and a separate air outlet for the case.

9. A ball mill including a case and a rotatable annular ring in the case, there being fan vane arms connected to the ring and screen drum walls supported by the arms, and the arms being outside of the drum walls, a material inlet orifice for the screen drum, a removable blower case about the screen drum, a material outlet for the case, and a separate air outlet for the case.

10. A ball mill including a rotatable drum,

- a case enclosing the drum, and an upwardly extending air outlet for the case, :the outlet having an inclined wall for deflecting solids into the case and a solid outlet for the case below the air outlet, and communicating openings between the drum and the case. 11. A ball mill including a rotatable drum, acase enclosing the drum, discharge communication between the case and the drum, and adjustable gravity means controlling the rate of continuous discharge of solids from the case.

12. A ball mill including a rotatable drum, a case enclosing the drum, discharge communication between the case and the drum, and gravity means controlling the rate of discharge of solids from the case, in-

walls, and there being a blower case spaced from and enclosing the arms and drum, and adjustable means controlling the rate of continuous discharge of solids from the case.

14. A ball mill including a single rotatable trunnion, a bearin bracket for the trunnion, circumferential y spaced fan vane arms connected to the trunnion and screen drum walls supported by the arms, the arms being outside of the drum walls, and the-re being a blower case spaced from and enclosing the arms and drum, and adjustable means controlling the rate of continuous discharge of solids from the case.

15. A ball mill including a rotatable annular ring, fan vane arms connected to the ring, and screen drum walls supported by the arms, the arms being outside of the drum walls, and there being a blower case s aced from and enclosing the arms and rum, and adjustable means controlling the rate of continuous discharge of solids from the case.

16. A ball mill including a case and a rotatable annular ring in the case, there being fan vane arms connected to the ring and screen drum walls supported by the arms, the arms being outside of the drum walls, and there being a blower case spaced from and enclosing the arms and drum, and adjustable means controlling the rate of continuous discharge of solids from the case.

In testimony that I claim the above, I have hereunto subscribed my name.

WILLIAM M. BARKER. 

